An Adaptive Regulation Heat Exchange System and Method for a Permanent Magnet Motor

Abstract

The present invention relates to an adaptive regulation heat exchange system and method for a permanent magnet motor. The system adds a water flow channel to the original motor stator. An inlet and an outlet are respectively provided at both ends of the water flow channel. A magnetic adsorption type temperature sensor is added inside the system as a temperature monitoring device, and a magnetic adsorption type signal transmitting device is added as an alarm device. A hydraulic circuit is added outside the permanent magnet motor. The temperature monitoring device is connected to a computer, and transmits the collected temperature data to the computer. The program control system in the computer adjusts the flow rate of water in the water flow channel during heat exchange through the hydraulic circuit according to the monitored temperature conditions to achieve heat exchange; the alarm device and the program control system can communicate remotely. This method can monitor the permanent magnet motor in real time, and give an alarm in time when the system temperature is abnormal, which is faster, more efficient and safer.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor heat exchange, and particularly relates to a permanent magnet motor adaptive regulation heat exchange system and method. Background Art

[0002] At present, electric motors are very important in daily production work. Permanent magnet motors are the most common motors in industrial production. However, with the rapid development of today's society, the required speed of industrial production has increased. As the most common equipment in industrial production, permanent magnet motors need to bear an increasing load, and the overheating problem has become more prominent. It is urgent to improve the efficiency of permanent magnet motors. In today's production work, the large-load state has become more and more common, and the original heat exchange method can no longer meet the needs of today's society. At present, overheating during the operation of motors has become a problem in production work. In the current research on its heat exchange, a permanent magnet motor adaptive regulation heat exchange system can effectively solve the motor heat exchange problem, accelerate the motor heat exchange efficiency, reduce the downtime, and improve the industrial production efficiency. The currently widely used motor heat exchange methods are air flow heat exchange, water heat exchange, and simple heat exchanger heat exchange. These single heat exchange methods can barely meet the working requirements under the conditions of low working load and low heat generation. In today's society, under the conditions of high load and high production demand, the system often overheats and causes work interruption. On the one hand, it reduces the work efficiency. On the other hand, there are safety hazards. Moreover, the previous motor systems lacked temperature monitoring, had no temperature monitoring unit, could not respond according to the temperature, select a reasonable heat exchange method according to the system temperature, and stop working under necessary conditions to prevent danger. With the acceleration of modernization, the requirements of industrial production are getting higher and higher, and the requirements of society for production efficiency have increased. The existing technologies can no longer meet the working needs.

[0003] Therefore, there is an urgent need for a more rapid, efficient and safe permanent magnet motor adaptive regulation heat exchange system and method to solve the above problems. Summary of the Invention

[0004] In view of the deficiencies of the existing technologies, the present invention provides a permanent magnet motor adaptive regulation heat exchange system and method, which can monitor the permanent magnet motor in real time, give an alarm in time when the system temperature is abnormal, and is more rapid, efficient and safe.

[0005] The present invention is implemented by adopting the following technical solutions:

[0006] An adaptive regulation and heat exchange system for a permanent magnet motor adds a water flow channel to the original motor stator. The two ends of the water flow channel are respectively provided with a water inlet and a water outlet. A magnetic temperature sensor is added inside the system as a temperature monitoring device, and a magnetic signal transmitting device is added as an alarm device. A hydraulic circuit is added outside the permanent magnet motor. The temperature monitoring device is connected to a computer and transmits the collected temperature data to the computer. The program control system in the computer adjusts the flow rate of the water in the water flow channel during heat exchange through the hydraulic circuit according to the monitored temperature conditions to achieve heat exchange; the alarm device and the program control system can communicate remotely.

[0007] The temperature monitoring device is installed inside the permanent magnet motor, which can not only play a role in temperature monitoring but also does not affect the normal operation of the permanent magnet motor.

[0008] The hydraulic circuit includes a flow control valve, a directional control valve, a pressure control valve, and a variable pump. A filter and a condenser are also added. The flow control valve and the variable pump are controlled by the program control system of the computer.

[0009] The regulation method of the above-mentioned adaptive regulation and heat exchange system for a permanent magnet motor is as follows:

[0010] Set the heat exchange start temperature value of the water flow channel, the first critical temperature, and the second critical temperature. The start temperature is the critical temperature at which the original heat exchange method of the permanent magnet motor cannot meet the system heat dissipation requirements. The first critical temperature is the critical temperature at which the small-flow heat exchange method of the heat exchange system cannot meet the heat dissipation of the permanent magnet motor. The second critical temperature is the critical temperature at which there will be potential safety hazards if the permanent magnet motor continues to operate; use the temperature monitoring device to monitor the system temperature and feedback the temperature information to the computer. The computer converts the temperature into a digital quantity through A / D conversion and transmits it to the program control system of the computer. The program control system selects the heat exchange method and intensity according to the data feedback by the temperature monitoring device. When the system temperature is lower than the start temperature, no water-cooled heat exchange is required, and only the air flow method is used to heat exchange the permanent magnet motor; when the system temperature reaches the start temperature but does not reach the first critical temperature, heat exchange is carried out through the water flow channel. The program control system transmits an instruction to the hydraulic circuit, and the hydraulic circuit uses the variable pump and the flow control valve to adjust the water flow velocity and flow rate, and starts small-flow water-cooled heat exchange. Small-flow heat exchange means selecting the most economical heat exchange flow rate when the water-cooled heat exchange system works to ensure meeting the heat exchange requirements during the operation of the permanent magnet motor and realizing heat exchange; when the system temperature reaches the first critical temperature but has not reached the second critical temperature, large-flow water-cooled heat exchange is started by adjusting the variable pump and the flow control valve. When the large-flow heat exchange work is started, the heat exchange system will work under the condition of maximum power, and the flow velocity and flow rate are both the maximum values of the hydraulic system. At this time, the alarm device issues a warning signal, and the system makes a timely response to reduce the load and speed, which can reduce the system working load; when the system temperature reaches the second critical temperature, the alarm device alarms, and at this time the permanent magnet motor stops for cooling.

[0011] The beneficial effects of the present invention are as follows:

[0012] 1. The present invention adds a water flow channel to the original motor stator. While the stator still meets the working requirements of the permanent magnet motor, its heat exchange capacity is enhanced, the cycle is greatly shortened, and heat exchange is efficiently achieved.

[0013] 2. By adding a water flow channel, a temperature monitoring device and an alarm device, the present invention can perform heat exchange on the permanent magnet motor and monitor its temperature, solving the drawback of the lack of safety monitoring in the original method; and the water flow rate can be adjusted in real time according to the actual situation to ensure the safe and reliable operation of the permanent magnet motor, ensuring both the heat exchange efficiency and avoiding overheating during operation, which may affect the service life of the equipment, eliminating potential safety hazards, and preventing safety accidents caused by overheating at the same time.

[0014] 3. The present invention solves the problems of great limitations and low efficiency in the original method. By using the method of adding a water flow channel to the stator and adopting a hydraulic circuit to control the water flow rate and velocity to achieve overall heat exchange, it solves the problem of insufficient heat exchange in the original method and improves the heat exchange efficiency.

[0015] 4. In the present invention, the program control system of the computer can issue different instructions to the hydraulic circuit according to the temperature data fed back by the temperature monitoring device, control the flow rate in the water flow channel, and reduce the flow rate and flow of water in the water flow channel when the system does not require large flow rate and large flow of water cooling, reducing the working pressure of the hydraulic system, saving energy and reducing costs.

[0016] 5. The present invention improves both the production efficiency and safety of the permanent magnet motor and has wide popularization in industrial production. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the hydraulic circuit in the present invention;

[0018] Figure 2 It is a schematic diagram of the heat exchange process of the water flow channel of the permanent magnet motor in the present invention;

[0019] Figure 3 It is a computer processing flow chart in the present invention;

[0020] Figure 4 It is a block diagram of the computer program control system in the present invention;

[0021] Figure 5 It is a block diagram of the alarm system program in the present invention;

[0022] Figure 6 It is a front view of the stator with the added water flow channel in the present invention;

[0023] Figure 7Left view of the stator with an additional water flow path in the present invention;

[0024] Among them,

[0025] 1 - Permanent magnet motor, 2 - Directional control valve, 3 - Filter, 4 - Pressure control valve, 5 - Variable pump, 6 - Condenser, 7 - Flow control valve, 8 - Water flow path, 9 - Inner surface of the stator, 10 - Outer surface of the stator, 11 - Water inlet, 12 - Water outlet. Detailed implementation manners

[0026] To better explain the present invention for easy understanding, the technical solutions and effects of the present invention will be described in detail below with reference to the drawings through specific implementation manners.

[0027] As Figures 1-3 shown, an adaptive regulation heat exchange system for a permanent magnet motor adds a water flow path 8 to the original motor stator. The two ends of the water flow path 8 are respectively provided with a water inlet 11 and a water outlet 12. The heat exchange of the permanent magnet motor 1 is realized by the flow of water in the water flow path 8. A magnetic adsorption type temperature sensor is added as a temperature monitoring device (not shown in the figure) and a magnetic adsorption type signal transmitting device is added as an alarm device (not shown in the figure) inside the system, and a hydraulic circuit is added outside the permanent magnet motor 1.

[0028] As Figures 6-7 shown is the stator with a rectangular water flow path 8 after transformation. A rectangular water flow path 8 is opened between the inner surface 9 and the outer surface 10 of the stator. The water cooling method is used to cool the system. The water flow path 8 is set as a rectangle, which can increase the contact area, improve the heat exchange efficiency, and prevent danger caused by overheating of the system.

[0029] The hydraulic circuit includes a flow control valve 7, a directional control valve 2, a pressure control valve 4, and a variable pump 5, and a filter 3 and a condenser are also added. The flow control valve 7 and the variable pump 5 are controlled by a program control system of a computer (not shown in the figure); during the working process, the opening pressure of the pressure control valve 4 is adjusted to the maximum safe working pressure of the system. When the system pressure exceeds the opening pressure of the pressure control valve 4, the pressure control valve 4 opens for unloading work, playing a role in protecting the hydraulic circuit.

[0030] The temperature monitoring device is connected to the computer. The temperature monitoring device transmits the detected temperature signal to the computer. The computer converts the temperature into a digital quantity through A / D conversion and transmits it to the program control system in the computer. The program control system decides whether to start the heat exchange of the water flow path according to the monitored temperature situation. When heat exchange of the water flow path is required, the flow rate of water in the water flow path 8 during the heat exchange process is adjusted through the hydraulic circuit to achieve heat exchange; the temperature monitoring device is installed inside the permanent magnet motor 1, which can not only play a role in temperature monitoring but also does not affect the normal operation of the permanent magnet motor 1.

[0031] The alarm device and the program control system can communicate remotely, be able to give an early warning when the temperature reaches the first critical temperature, and the system makes a timely response to reduce the load and speed to lower the working load of the system. When the temperature reaches the second critical temperature, an alarm is given. When the system alarms, the permanent magnet motor 1 stops for cooling.

[0032] As Figures 4-5 shown, during the operation of the permanent magnet motor 1, three temperatures X, Y, and Z are respectively set. Among them, the X temperature is defined as the starting temperature, Y as the first critical temperature, and Z as the second critical temperature. The X temperature is the critical temperature at which the original heat exchange method of the permanent magnet motor cannot meet the heat dissipation requirements of the system. The Y temperature is the critical temperature at which the small-flow heat exchange method adopted by the heat exchange system cannot meet the heat dissipation of the permanent magnet motor. Z is the critical temperature at which there will be potential safety hazards if the permanent magnet motor continues to operate. When the system temperature detected by the temperature sensor exceeds X but does not exceed Y, the water flow channel heat exchange is started. At this time, it is the small-flow heat exchange method. The small-flow heat exchange means selecting the most economical heat exchange flow rate when the water-cooled heat exchange system works. When the system temperature reaches the second critical temperature Y but does not reach the second critical temperature Z, there are potential safety hazards in the long-term operation of the system. At this time, the alarm device sends a warning signal to the computer, and the water flow channel heat exchange method needs to increase the flow rate and flow velocity to start the large-flow water-cooled heat exchange. When the large-flow heat exchange is started, the heat exchange system will work under the condition of maximum power, and the flow velocity and flow rate are both the maximum values of the hydraulic system, accelerating the heat exchange speed. At the same time, the load and speed of the system are reduced to ensure the safe operation of the system. When the system temperature reaches the second critical temperature Z, the permanent magnet motor 1 must stop quickly for cooling. At this time, the water flow channel heat exchange process continues to maintain the large-flow heat exchange situation to accelerate the heat exchange rate and ensure the safe operation of the system.

[0033] The regulation method of the above-mentioned adaptive regulation heat exchange system of the permanent magnet motor is as follows:

[0034] Use the temperature monitoring device to monitor the system temperature and feedback the temperature information to the computer. After A / D conversion by the computer, the temperature is converted into a digital quantity and transmitted to the program control system of the computer. The program control system selects the heat exchange method and heat exchange intensity according to the system temperature data of the permanent magnet motor 1 fed back by the temperature monitoring device, that is, decides whether to adopt the water flow channel 8 for heat exchange. When the system temperature is lower than the starting temperature, no water-cooled heat exchange is required, and only the air flow method is used to heat exchange the permanent magnet motor. When the system temperature reaches the starting temperature but does not reach the first critical temperature X, the water flow channel 8 is used for heat exchange. The program control system transmits the instruction to the hydraulic circuit, the reversing valve 2 is opened, and the hydraulic circuit uses the functions of the variable pump 5 and the flow control valve 7 to adjust the flow velocity and flow rate of water, and starts the small-flow water-cooled heat exchange to ensure that the heat exchange required during the operation of the permanent magnet motor 1 is met and the heat exchange is realized.

[0035] The alarm device and the program control system can communicate remotely. The temperature monitoring device monitors the system temperature in real time. When the system temperature reaches the first critical temperature Y but has not reached the second critical temperature Z, large-flow water-cooled heat exchange is started by adjusting the variable pump and the flow control valve. The program control system controls the variable pump 5 and the flow control valve 7 to increase the flow rate and velocity and accelerate the heat exchange speed. At this time, the alarm device issues a warning signal, and at this time, the load and speed of the heat exchange system need to be reduced to ensure the safe operation of the system; when the temperature reaches the second critical temperature Z, the alarm device sends an alarm signal to the computer. At this time, the permanent magnet motor 1 needs to stop for cooling, and at the same time, ensure that the water flow channel heat exchange is carried out under the condition of maximum power to accelerate the heat exchange rate and ensure the safety of the entire heat exchange system.

[0036] After the heat exchange work is completed, since impurities may appear in the water flow channel 8 and the water temperature will increase significantly during the heat exchange process, a filter 3 and a condenser 6 are added to the circuit. After the water in the water flow channel 8 completes the heat exchange work, it first flows through the filter 3 to ensure the cleanliness of the water and prevent the heat-exchanged water from having impurities and damaging the hydraulic components. Then the cooling water flows through the condenser 6 to achieve temperature reduction, ensuring that there is still a large temperature difference between the water inlet 11 and the water outlet 12 of the water flow channel 8 during the next working process, and ensuring that the heat exchange work can proceed normally.

Claims

1. An adaptive regulation and heat exchange system for a permanent magnet motor, characterized in that: A water flow channel is added to the original motor stator. An inlet and an outlet are respectively provided at both ends of the water flow channel. A magnetic temperature sensor is added inside the system as a temperature monitoring device, and a magnetic signal transmitting device is added as an alarm device. The temperature monitoring device is installed inside the permanent magnet motor, which can not only monitor the temperature but also does not affect the normal operation of the permanent magnet motor. A hydraulic circuit is added outside the permanent magnet motor. The temperature monitoring device is connected to a computer, and the collected temperature data is transmitted to the computer. The program control system in the computer adjusts the flow rate of the water in the water flow channel during the heat exchange process through the hydraulic circuit according to the monitored temperature conditions to achieve heat exchange. The alarm device and the program control system can communicate remotely. The hydraulic circuit includes a flow control valve, a directional valve, a pressure control valve, and a variable pump. During the working process, the opening pressure of the pressure control valve is adjusted to the maximum safe working pressure of the system. When the system pressure exceeds the opening pressure of the pressure control valve, the pressure control valve opens for unloading work. A filter and a condenser are also added. The flow control valve and the variable pump are controlled by the program control system of the computer.

2. The regulation method of an adaptive regulation heat exchange system for a permanent magnet motor according to claim 1, characterized in that: Specifically as follows: Set the heat exchange opening temperature value, the first critical temperature, and the second critical temperature of the water flow channel. The opening temperature is the critical temperature at which the original heat exchange method of the permanent magnet motor cannot meet the system heat dissipation requirements. The first critical temperature is the critical temperature at which the small-flow heat exchange method of the heat exchange system cannot meet the heat dissipation of the permanent magnet motor. The second critical temperature is the critical temperature at which there will be potential safety hazards if the permanent magnet motor continues to operate. Use the temperature monitoring device to monitor the system temperature and feedback the temperature information to the computer. The computer converts the temperature into a digital quantity through A / D conversion and transmits it to the program control system of the computer. The program control system selects the heat exchange method and intensity according to the data feedback by the temperature monitoring device. When the system temperature is lower than the opening temperature, no water-cooled heat exchange is required, and only the air flow method is used to heat exchange the permanent magnet motor. When the system temperature reaches the opening temperature but does not reach the first critical temperature, heat exchange is carried out through the water flow channel. The program control system transmits an instruction to the hydraulic circuit. The hydraulic circuit uses the variable pump and the flow control valve to adjust the water flow rate and flow, and starts small-flow water-cooled heat exchange. The small-flow heat exchange selects the most economical heat exchange flow rate when the water-cooled heat exchange system works to ensure meeting the heat exchange requirements during the operation of the permanent magnet motor and achieve heat exchange. When the system temperature reaches the first critical temperature but has not reached the second critical temperature, large-flow water-cooled heat exchange is started by adjusting the variable pump and the flow control valve. When the large-flow heat exchange work is started, the heat exchange system will work under the condition of maximum power, and the flow rate and flow are both the maximum values of the hydraulic system. At this time, the alarm device issues a warning signal, and the system makes a timely response to reduce the load and speed to reduce the system working load. When the system temperature reaches the second critical temperature, the alarm device alarms, and at this time the permanent magnet motor stops for cooling.

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